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The award-winning Phase Change Matters blog tracks the latest news and research on phase change materials and thermal energy storage. E-mail tips and comments to Ben Welter, communications director at Entropy Solutions. Follow the blog on Twitter at @PureTemp. Subscribe to the weekly PCM newsletter. Or join the discussion on LinkedIn.

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Research roundup: Corrosion effect of Micronal PCMs; photovoltaic-thermal system optimization; diatomite-based composite; more

Ben Welter - Monday, September 09, 2019

From Renewable Energy and Sustainable Buildings:

Study of Corrosion Effect of Micronal® Phase Change Materials (PCM) with Different Metal Samples
Use of Phase Change Materials for Solar Systems Applications
Performance Optimization of Concentrated Photovoltaic-Thermal (CPV-T) System Employing Phase Change Material (PCM) in Hot Climate

From Asia International Symposium on Mechatronics:

Investigation for a Phase Change Immersion Cooling System

From Energy Conversion and Management:

Experimental study of active phase change cooling technique based on porous media for photovoltaic thermal management and efficiency enhancement

From Renewable Energy:

Enhanced properties of diatomite-based composite phase change materials for thermal energy storage
Hybrid thermal energy storage with phase change materials for solar domestic hot water applications: Direct versus indirect heat exchange systems

From Journal of Applied Polymer Science:

Surface modification of MWCNT and its influence on properties of paraffin/MWCNT nanocomposites as phase change material

From Energy and Buildings:

Energy and emissions analysis of ice thermal energy storage in the western US
Thermal energy storage characterization of cementitious composites made with Recycled Brick Aggregates containing PCM

From Solar Energy:

Innovative passive heat-storage walls improve thermal performance and energy efficiency in Chinese solar greenhouses for non-arable lands

From Construction and Building Materials:

Development of structural thermal energy storage concrete using paraffin intruded lightweight aggregate with nano-refined modified encapsulation paste layer

From Applied Energy:

A comprehensive review on positive cold energy storage technologies and applications in air conditioning with phase change materials

From International Journal of Energy Research:

Preparation and characterization of nano‚Äźenhanced myristic acid using metal oxide nanoparticles for thermal energy storage
Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

From xPRESS Polymer Letters:

Editorial corner – a personal view / Thermal management with polymer composites

From International Symposium on Asphalt Pavement & Environment:

Impregnation of Lightweight Aggregate Particles with Phase Change Material for Its Use in Asphalt Mixtures

From Journal of Sol-Gel Science and Technology:

Development of new inorganic shape stabilized phase change materials with LiNO3 and LiCl salts by sol-gel method

From Advanced Functional Materials:

Functional Soft Composites As Thermal Protecting Substrates for Wearable Electronics

PCM briefing: Funding for AMP Clean Energy project; 1414 Degrees to test 'SmartFarm" applications

Ben Welter - Monday, August 19, 2019

Innovate UK’s Knowledge Transfer Partnership has awarded funding to a joint effort by AMP Clean Energy and the University of Birmingham to develop a thermal energy storage system. The system will incorporate phase change material developed by the university for use in AMP’s Urban Reserve flexible electricity generation plants, which will turn waste heat into electricity. The amount of funding was not disclosed.

• Geocryologist Christopher Stevens of SRK North America will give a PCM-related presentation at this week's International  Conference on Cold Regions Engineering in Quebec City: "Phase Change Materials – Innovation in Adaptation Technology to Address Permafrost Thaw" (Aug. 21).

• Australian start-up 1414 Degrees has announced a joint project with Nectar Farms to test “SmartFarm” applications of 1414's technology, which stores electricity as thermal energy by heating and melting containers full of silicon. 

PCM briefing: PureTemp fabrics featured at Materio library; new round of funding for Ecozen Solutions

Ben Welter - Friday, July 26, 2019

PureTemp-enhanced fabrics were among the new materials presented at a gathering of architects, designers and journalists at the MatériO library in Paris this week. The materials library, which also has showrooms in Brussels, Seoul and Shanghai, lists thousands of "cutting edge" materials and technologies in its online database, including PureTemp's biobased PCM.

Southern Research opened the new Energy Storage Research Center on its engineering campus in Birmingham, Ala., this month. The center will work to speed the development of clean and sustainable energy storage technology, including thermal energy storage systems. 

Ecozen Solutions of India, which makes portable solar cold rooms for use on small farms, recently closed a Series A round of funding from investors including impact investment fund manager Caspian and Hivos-Triodos Fund, which is affiliated with Netherlands-based Triodos Bank. Omnivore Capital Management Advisors, which originally invested in Ecozen in 2015, also participated in the round, AgFunder News reports. The solar cold room's thermal storage unit can store power for more than 36 hours in case of cloudy or rainy weather. 

Research roundup: Thermal conductivity; decarbonization potential of compact heat storage; liquid desiccant cooling systems; more

Ben Welter - Wednesday, February 06, 2019

From Energy:

Effects of thermal conductivity and density on phase change materials-based thermal energy storage systems

From Renewable Energy:

Melting process investigation of phase change materials in a shell and tube heat exchanger enhanced with heat pipe

From Applied Thermal Engineering:

Compact latent heat storage decarbonisation potential for domestic hot water and space heating applications in the UK
Numerical and experimental study of phase-change temperature controller containing graded cellular material fabricated by additive manufacturing
A novel composite phase change material with paraffin wax in tailings porous ceramics
Characterisation and evaluation of a new phase change enhanced working solution for liquid desiccant cooling systems
Thermal properties enhancement and application of a novel sodium acetate trihydrate-formamide/expanded graphite shape-stabilized composite phase change material for electric radiant floor heating

From Environmental Research:

Latent heat storage biocomposites of phase change material-biochar as feasible eco-friendly building materials

From Colloids and Surfaces A:

A facile microencapsulation of phase change materials within silicone-based shells by using glass capillary devices

From Microporous and Mesoporous Materials:

Phase change in modified metal organic frameworks MIL-101(Cr): Mechanism on highly improved energy storage performance

From Applied Energy:

Role of porous metal foam on the heat transfer enhancement for a thermal energy storage tube
Energy saving performance assessment and lessons learned from the operation of an active phase change materials system in a multi-storey building in Melbourne

From Building and Environment:

Comparative analysis of the PCM application according to the building type as retrofit system

From Construction and Building Materials:

Evaluation of the potential use of form-stable phase change materials to improve the freeze-thaw resistance of concrete

From Results in Physics:

Application Research of Nano-storage Materials in Cold Chain Logistics of E-commerce Fresh Agricultural Products

From Journal of Energy Storage:

Using PCM as energy storage material in water tanks: Theoretical and experimental investigation

Research roundup: Thermo-regulating bamboo fabric; PCM emulsions; nanoparticle-enhanced composite; more

Ben Welter - Friday, November 30, 2018

From Journal of Cleaner Production:

Autonomous greenhouse microclimate through hydroponic design and refurbished thermal energy by phase change material

From Journal of Energy Storage:

Development of heat accumulation unit based on heterogeneous structure of MF/PCM for cogeneration units

From Textile Research Journal:

Preparation and evaluation of thermo-regulating bamboo fabric treated by microencapsulated phase change materials

From International Journal of Clothing Science and Technology:

Development of thermo-regulating fabrics using PCM microcapsules with poly(methyl methacrylate-co-2-hydroxy ethyl methacrylate) shell and n-alkane core

From Canadian Society for Mechanical Engineering International Congress:

Preparation and Properties of Nanoparticle-enhanced Composite Phase Change Material with Ceramic Porous Media

From Solar Energy Materials and Solar Cells:

A comprehensive review on phase change material emulsions: Fabrication, characteristics, and heat transfer performance

From 59th Conference on Simulation and Modelling:

Convective Melting Modeling Approach for Phase Change Materials with Variable Boundary Heating

From Energy Conversion and Management:

Simultaneous energy storage and recovery in the triplex-tube heat exchanger with PCM, copper fins and Al2O3 nanoparticles

From International Journal of Energy Research:

Operation strategies guideline for packed bed thermal energy storage systems [pdf]

From Journal of Molecular Liquids:

Solidification process of hybrid nano-enhanced phase change material in a LHTESS with tree-like branching fin in the presence of thermal radiation

From Energy:

Experiment study on thermal performance of building integrated with double layers shape-stabilized phase change material wallboard

PCM briefing: RAL members to meet in Dusseldorf next week; reliability test completed at Morocco CSP plant

Ben Welter - Friday, November 09, 2018

• Members of the RAL Quality Association PCM will meet in Dusseldorf on Thursday, Nov. 15. The agenda includes discussions on quality and testing specifications; reference materials in calorimetry; PCM product certification; and the promotion of PCM products in the European Union, Germany, Netherlands and the United States.

A 10-day reliability test has been completed at the 150MW Noor Ouarzazate III concentrated solar power plant in Morocco. The plant's molten salt storage system is designed to produce electricity in the absence of sunlight for 7.5 hours. During the test, the plant output over 13.2 GWh to the grid.

Kathu Solar Park, the 100MW concentrated solar power plant in South Africa's Northern Cape Province, has begun generating steam, an important step in the plant's commissioning process. The plant uses molten salt to store heat from the solar field for up to 4.5 hours. The heat can be recovered to produce steam and generate electricity.

• The agenda is taking shape for the 3rd Sustainable Oils & Fats International Congress, to be held April 4-5, 2019, in Paris. Among the topics: "Sourcing & Production of Sustainable Oils & Fats" and "Creating, Maintaining, Controlling Sustainable Supply Chain." 

Emirates Central Cooling Systems Corp. says it is on track to establish the world’s largest district cooling project by increasing its capacity of district cooling in Business Bay, Dubai. Business Bay is now served by three major district cooling plants with a total capacity of 135,000 refrigeration tons. The addition of three more plants will bring the collective capacity to 350,000 RT.

Research roundup: Sodium acetate trihydrate; palm kernel vegetable fat; spiral-fin heat exchanger; gas flow through bed of granular PCM; more

Ben Welter - Tuesday, November 06, 2018

From Energy:

Preparation and thermal properties of sodium acetate trihydrate as a novel phase change material for energy storage

From Journal of Building Engineering:

The Palm Kernel Vegetable Fat: a Low-cost Bio-based Phase Change Material for Thermal Energy Storage in Buildings

From International Journal of Applied Engineering Research:

Carbonaceous Phase Change Nanocomposites: A low cost energy storage approach [pdf]

From Applied Mathematical Modelling:

Investigation of Phase Change in a Spiral-Fin Heat Exchanger

From Applied Energy:

Numerical investigation of the thermal performance enhancement of latent heat thermal energy storage using longitudinal rectangular fins and flat micro-heat pipe arrays

From Materials Science and Engineering:

The characteristics of temperature fluctuations in thermal insulation covered with layer of PCM [pdf]

From Applied Thermal Engineering:

Thermal properties and applications of microencapsulated PCM for thermal energy storage: A review

From International Journal of Heat and Mass Transfer:

Evaluation and optimization of thermal performance for a finned double tube latent heat thermal energy storage
Influence of gas compressibility on gas flow through bed of granular phase change material

From Journal of Energy Storage:

From International Journal of Refrigeration:

Investigating organic phase change behavior with thermal photography

PCM briefing: Isomer can store energy for up to 18 years; concept combines pumped storage and heat storage using water as a medium

Ben Welter - Friday, November 02, 2018

• Researchers at Chalmers University of Technology and Universidad de La Rioja have created a system capable of storing solar energy for extended periods. The Molecular Solar Thermal Energy Storage system uses a molecular photo switch made from carbon, hydrogen and nitrogen. Sunlight turns the molecule into an energy-rich isomer. The isomer can be stored in a liquid form to be used for heating at night or in winter. “The energy in this isomer can now be stored for up to 18 years. And when we come to extract the energy and use it, we get a warmth increase which is greater than we dared hope for,” said Kasper Moth-Poulsen, professor at Chalmers.

• New research at California's Lawrence Livermore National Laboratory reveals how an unusual type of ice known as Ice VII can form at speeds over 1,000 miles per hour. "This ice type was only discovered occurring naturally in March, trapped inside diamonds deep underground," reports Science Alert, "and this latest study looks in detail at how exactly it takes shape – apparently in a way that's completely different to how water usually freezes into ice."

• A research team at the Graz University of Technology, Austria, has combined the advantages of pumped storage technology and heat storage using water as a medium in a hybrid storage concept called "hot-water pumped storage hydropower." The new system stores and supplies electricity, heat and cooling energy. 

• The U.S. Department of Energy's Advanced Research Projects Agency-Energy (ARPA-E) has openings for program directors, tech-to-market advisors and two-year fellowships.  

Registration is open for the 2019 ARPA-E Energy Innovation Summit, to be held in Denver, Colo., July 8-10. Now in its 10th year, the annual conference and technology showcase "brings together experts from different technical disciplines and professional communities to think about America’s energy challenges in new and innovative ways."

A full agenda is available for the World Bio Markets conference, to be held in Amsterdam, Netherlands, April 1-3. Speakers include Rolf Hogan, executive director, Roundtable on Sustainable Biomaterials; Chris Sayner, vice president customer alliances, corporate sustainability, Croda; and Davide Bragholi, project manager, environmental innovations, Tetra Pak. 

• Registration is open for the inaugural Thermal Materials Summit to be held in Los Angeles on May 2. This technical forum will explore the latest advancements in thermal interface materials for professionals working in aerospace, automotive, telecom, batteries and other fields. Presentation proposals are due by Dec. 7.

Ecozen Solutions of India is one of five finalists in Rabobank’s inaugural Food Loss Challenge Asia. The competition aims to identify innovative ag-tech start-ups working to solve farm-to-market food loss problems. The finalists will present their solutions to a panel of judges at Rabobank’s annual Asia Food & Agribusiness advisory board meeting in Singapore later this month. Ecozen makes portable solar cold rooms for small farms, using a thermal storage unit that can store power for more than 36 hours in case of cloudy or rainy weather.

PCM briefing: Online master's degree in thermal energy storage; Alexium appoints new CFO

Ben Welter - Thursday, September 27, 2018

Dr. Luisa F. Cabeza• The enrollment period is open for an online master's degree program on thermal energy storage. The program, offered by the University of Lleida and the University of Barcelona, includes "training in technical aspects of TES and the energy system, but it also includes soft skills in patenting and entrepreneurship." The program is directed by Dr. Luisa F. Cabeza of the University of Lleida. 

Siemens Gamesa held a topping-out ceremony this week for its 30MWh electric thermal energy storage facility in Hamburg-Altenwerder, Germany. The pilot facility, which stores energy in 1,000 tons of rock fill at temperatures of 600º C, is in its final phase of construction and due to be fully commissioned in 2019.

• Lauren Boteler, a thermal/packaging engineer for the U.S. Army Research Laboratory's Sensors and Electron Devices Directorate, has been named Woman Engineer of the Year by the American Society of Mechanical Engineers' Electronics Packaging and Photonics Division.

Indonesia has imposed a three-year moratorium on new palm oil plantations and ordered a review of existing ones in an effort to address sustainability and environmental concerns.  

• The U.S. patent system, the first in the world to incentivize large numbers of ordinary citizens to innovate, has long been ranked No. 1 in the world. But over the past few years the system has fallen to 12th. Forbes reports that Andrei Iancu, the new director of the U.S. Patent and Trademark Office, is working to turn that around and "bring about a much-needed revitalization of the American patent system."

Alexium International has appointed Jason Lewis as chief financial officer, succeeding Aaron Krech, who resigned effective Sept. 30. Lewis has over 20 years of experience in financial roles in the specialty chemicals industry. Alexium also announced the appointment of Allen Reihman as chief commercial officer. He will lead the company’s sales, marketing and technology commercialization efforts. Alexium, based in Greer, S.C., and Perth, Australia, makes flame-retardant and PCM-enhanced fabric treatments.

USDA seeks to add PCM category to BioPreferred Program

Ben Welter - Monday, September 24, 2018

The U.S. Department of Agriculture is proposing to add phase change material as a category of biobased products eligible for procurement preference by federal agencies and their contractors.

USDA BioPreferred labelPhase change material is not currently one of the 109 categories in the USDA's BioPreferred Program. But biobased PCM products are still eligible to participate in the program if they become certified through a voluntary labeling initiative, explained Caroline Tapscott, BioPreferred Program scientist. Products made by three PCM manufacturers – Croda Inc., Phase Change Energy Solutions and PureTemp LLC – qualified for the BioPreferred catalog through that initiative.

The current minimum biobased content for products in such "certification-only" categories is 25 percent. The USDA is proposing to raise the minimum to 71 for phase change materials. All PCM products now listed in the catalog meet that threshold.

The BioPreferred Program was created by the Farm Security and Rural Investment Act of 2002 and expanded by the Food, Conservation, and Energy Act of 2008. The purpose is to increase the use of biobased products.

Under the program, federal agencies are required, with some exceptions, to purchase biobased products within designated product categories when the purchase price of the product exceeds $10,000 or when the quantity of such products or functionally equivalent products purchased over the preceding fiscal year equaled $10,000 or more.

In the document describing the proposed rule changes, the USDA says it "has been unable to obtain data on the amount of phase change materials purchased by federal procuring agencies" but "believes that some federal agencies and their contractors do and would likely purchase these types of products."

The USDA is proposing to add 29 other biobased categories as well, including adhesives, concrete curing agents, exterior paints and facial care products. Public comments on the proposed rule changes will be accepted until Nov. 13, 2018.

https://www.federalregister.gov/documents/2018/09/14/2018-19681/designation-of-product-categories-for-federal-procurement